U.S. patent number 4,415,343 [Application Number 06/396,787] was granted by the patent office on 1983-11-15 for sealing systems for filter bags.
Invention is credited to Adolf Margraf.
United States Patent |
4,415,343 |
Margraf |
November 15, 1983 |
Sealing systems for filter bags
Abstract
This invention relates to the sealing of the aperture rims of
cross-sectionally shallowly oval filter bags at the clean gas side
of a partition dividing the filter housing into dust gas and clean
gas spaces and provided with perforations. Use is made for sealing
purposes of a clamping frame placing the aperture rim of each
filter bag in contact with the partition at the clean gas side,
which is overbridged together with the corresponding partition
perforation by a twistable bridging element connected to the
clamping frame, at the dust gas side, which bridging element may be
placed in resilient contact with the dust gas side of the partition
via the bridging element ends and through bulging filter bag
portions by means of a spring system bearing on the clamping
frame.
Inventors: |
Margraf; Adolf (D-3060
Stadthagen, DE) |
Family
ID: |
6136962 |
Appl.
No.: |
06/396,787 |
Filed: |
July 9, 1982 |
Foreign Application Priority Data
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Jul 15, 1981 [DE] |
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3127926 |
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Current U.S.
Class: |
55/379; 55/294;
55/341.7; 55/509 |
Current CPC
Class: |
B01D
46/02 (20130101) |
Current International
Class: |
B01D
46/02 (20060101); B01D 046/02 () |
Field of
Search: |
;55/378,379,294,502,341HM,509 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Nozick; Bernard
Attorney, Agent or Firm: Balogh, Osann, Kramer, Dvorak,
Genova & Traub
Claims
I claim:
1. In a sealing system for the aperture rims of cross-sectionally
shallowly oval filter bags which are to be cleansed by counterflow
scavenging and/or shaking, situated at the clean gas side of a
partition subdividing the casing of a bag filter into a dedusting
space and a pure gas space and provided with shallowly oval
perforations, in each case by means of a shallowly oval
transversely overbridged clamping frame springily enclamping the
filter bag aperture rim between itself and the partition, the
bridging element of which bears the thrust of the spring system
which on the other hand bears under loading against said dust gas
side of said partition, said filter bags inserted into said
dedusting space via said perforations and each supported at its
free end and having a rigid internal spacing element terminating
before said partition, and which is supported in front of said
partition by parts of said clamping frame, the invention which
consists in that a spindle passes through an aperture in said
bridging element of each said clamping frame in rotatable and
longitudinally displaceable manner said spindle being firmly joined
at said dust gas side of said bridging element with a clamping
strap the length of which is greater than the lateral width of said
shallowly oval partition perforation and is surrounded at said
clean gas side by a compression spring which is situated between
said bridging element and a spindle stop, said clamping strap being
placeable under stress by axial displacement of said spindle.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a sealing system for the aperture
rims of cross-sectionally shallowly oval filter bags which are to
be cleansed by counterflow scavenging and/or shaking, situated at
the clean gas side of a partition subdividing the casing of a bag
filter into a dedusting space and a pure gas space and provided
with shallowly oval perforations, in each case by means of a
shallowly oval transversely overbridged clamping frame springily
enclamping the filter bag aperture rim between itself and the
partition, the bridging element of which bears the thrust of the
spring system which on the other hand bears under loading against
the dust gas side of the partition, the filter bags inserted into
the dedusting space via the perforations and supported at the free
end having a rigid internal spacing element terminating before the
partition, which is supported in front of the partition by parts of
the clamping frame. Hereinafter such a system will be referred to
as "of the kind described."
Known sealing systems for the filter bag aperture rim of the kind
described are exemplfied by German Specification No. OS 30 06 823,
are so formed that the overbridging element of the clamping frame
is connected to the one extremity of a traction spring directed
towards the dust gas side, the other end of which is joined to a
sleeve which bears on the bridging element in the idle position,
and the axial displacement of which places the spring system under
tractive stress, the latter then being borne via angle sections on
the partition at either side of the partition perforation at the
dust gas side by being turned through 90.degree., the filter bag
being enlarged or expanded a little in the area of the angle
sections, so that the angle sections bear on the partition via the
two lateral bag enlargements.
It is an object of the invention to simplify the construction of
the spring-loaded sealing system for the bag aperture rim.
SUMMARY OF THE INVENTION
Thus, in a sealing system of the kind described, the invention
consists in that spindle traversing a drilling of the bridging
element of each clamping frame in rotatable and longitudinally
displaceable manner is firmly joined to a clamping strap at the
dust gas side of the bridging element, the length of which is
greater than the lateral width of the shallowly oval partition
perforation, and is surrounded at the clean gas side by a
compression spring situated between the bridging element and a
spindle stop, which may be placed under stress by axial
displacement of the spindle.
This construction renders it possible for each filter bag
comprising a rigid internal spacing element to be manipulated
together with the clamping frame and to be inserted through a
partition perforation into the dust gas space, whilst at the same
time supporting the free end of the filter element and placing the
clamping frame with the aperture rim or aperture roll of the bag in
contact with the partition. It is then merely necessary to grip the
spindle by means of a tool at the clean gas side and to press the
same in the direction towards the dust gas space and then to twist
the same through 90.degree., so that the extremities of the
clamping strap may thereby be supported against the dust gas side
of the partition under slight bulging of the filter bag, as soon as
the axial inward thrust displacement of the spindle is stopped.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention may be more clearly understood
reference will now be made to the accompanying drawings which show
one embodiment thereof by way of example only and in which:
FIG. 1 shows a diagrammatical vertical cross-section through a bag
filter without illustrating the bag aperture rings which are to be
sealed,
FIG. 2 shows a vertical cross-section through the clamping frame
according to the invention along the line II to II of FIG. 3,
FIG. 3 shows an elevation corresponding to FIG. 2, as seen in the
direction of the arrow III,
FIG. 4 shows a partial vertical cross-section of a filter bag or
filter element fitted with the clamping frame, which is to be
inserted into the dust gas space, and
FIG. 5 shows a cross-section along the line V to V of FIG. 4, after
the spring-loaded sealing of the bag aperture rim has been
established by means of the clamping frame.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings in the embodiment shown, the bag
filter housing 1 is subdivided by a partition having parallel rows
of shallowly oval perforations 3 into a dedusting space 5 receiving
the filter bags 4 and comprising a dust gas feed 6, and a clean gas
space 7 having a clean gas offtake 8. A slotted nozzle 9 may
periodically be displaced back and forth along the rows of slots 3
for counterflow scavenging of the bags with clean air or compressed
air, or a periodically switchable compressed gas nozzle is
allocated to each filter bag 4.
The free ends of the filter bags 4 are supported in any desired
manner on the rear wall 1a of the housing, within the dust gas
space 5, and a dust collector space 10 having a dust gas outlet 11
is situated below the filter bags 4.
The advantageously beaded aperture rim 4a of the bags 4 is to be
sealed resiliently on the partition 2 at the clean gas side 7. To
this end, a clamping frame 12 as shown in FIGS. 2 and 3 is
utilised, comprising a flange 12a passing through the perforations
3 and which is provided with a transversely extending bridging
element 13. This bridging element 13 is perforated and a spindle 14
passes loosely through this perforation so that it can be twisted
therein. This spindle 14 is firmly joined to a clamping strap 15 at
one end at the dust gas side of the bridging element 13, and is
provided at its other end, at the clean gas side 7, with a stop 16
which can be gripped by a tool. The spindle 14 is surrounded
between the bridging element 13 and the stop 16 by a coil spring
free of stress in the idle position. The length of the clamping
strap 15 is a little greater than the transversely extending width
of the shallowly oval wall perforations 3. The flange 12a of the
clamping frame 12 is firmly joined to a supporting stirrup or bail
18 at the upper and lower extremities.
The clamping frame 12 described above is inserted into the open end
of the filter bags 4 provided with a rigid internal spacing element
19 terminating before the partition 2 and for example comprising
longitudinal and transverse wires, for assembling purposes, in such
manner that the supporting stirrup or bail 18 engages in the end
directed towards the partition 2 of the rigid spacing element 19.
This assembly is inserted through a partition perforation 3 into
the dust gas space 5 until the free end is supported, and the
aperture rim 4a of the bag then fits loosely with the clamping
frame 12 against the partition 2 at the clean gas side 7. Upon
inserting the filter bags into the dust gas space, the clamping
strap 15 is positioned in the direction of the greater diameter of
the partition perforation 2 or of the correspondingly profiled
filter bag 4.
The spindle stop 16 is thereupon gripped with a tool and then
pressed axially in the direction towards the dust gas space 5
whilst loading the compression spring 17, and is then turned
through 90.degree., so that the clamping strap 15 bears against the
dust gas side of the partition 2 under spring loading after
releasing the pressure, and in doing so enclamps two somewhat
bulging parts of the filter bag 4 as shown in FIG. 5. The
installation and sealing of each filter element are completed in
this manner.
* * * * *